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DCBones
Dodge Dakota
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7/17/2011
16:53:53
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 Subject: 3.9L Fuel Problem?
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Message:
I have a '94 Dakota with a 3.9L that will not start. It sat for about 10 years with a bad fuel pump. We changed the pump, drained the tank, new plugs, wires, cap and rotor, repaired some of the wires eaten through by mice, and it still wont start. Fuel pump is priming fine, engine turning, spark at coil and each cylinder, and clean fuel running to rail (Blew out the line). Any thoughts? We poured gas down the throttle body and it started for a sec. Could the rail be clogged or is it this bad splice near the relay I hear about? Would it be the bad splice if the pump is priming? Thanks!
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DCBones
Dodge Dakota
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7/20/2011
09:17:23
| RE: 3.9L Fuel Problem?
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Is there nothing that anyone can suggest for this problem? Could the injectors be clogged/ bad? I will try that splice but are there any other ideas?
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Curly
Dodge Dakota
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7/20/2011
09:23:04
| RE: 3.9L Fuel Problem?
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If you're getting fuel to the rail & spark it
wouldn't be the 115 splice.
The spark strong and hot enough?
The truck sitting this long 2 other things come to
mind.
Totally clogged injectors or clogged exhaust.
Mice,rats or tree rats (squirrels) could have
built a nest in it.
To check this remove the O2 and use the compressor
to blow some air through it.
Bang on the muffler with the side of your fist.
Does it sound full?
(they could have clogged that up)
Only way to check that is remove it.
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DCBones
Dodge Dakota
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7/20/2011
10:01:31
| RE: 3.9L Fuel Problem?
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Message:
Thanks. I will definitely check the exhaust. I did start for a sec when we poured fuel into the TB but then it gave a loud thump when dying. Any way to check the injectors though? Take off the rail and blow air through them? Thanks again!
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Curly
Dodge Dakota
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7/20/2011
12:01:31
| RE: 3.9L Fuel Problem?
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Message:
No, and that's a bad idea.
They would have to be flow tested and it's not
cheap.
*check the exhaust first*
You could always remove a few injectors and get a
look at the nozzles.
Problem here a truck sitting that long could have
a host of other problems.
Check the wires to your crank sensor also,
Make sure they are not broken or chewed.
(location-> back of motor toward passenger side,
2 bolts hold it in)
Take a flash light and take a good look down the
throttle body.
I'll keep checking back from time to time, offer
as much help as I can.
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DCBones
Dodge Dakota
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7/20/2011
18:39:56
| RE: 3.9L Fuel Problem?
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Message:
Thanks. I'll let you know when i have progress!
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Curly
Dodge Dakota
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7/21/2011
14:21:32
| RE: 3.9L Fuel Problem?
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Message:
How you making out DC? any luck?
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DCBones
Dodge Dakota
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7/31/2011
10:41:36
| RE: 3.9L Fuel Problem?
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Message:
Thanks Curly, I checked the crank sensor (hard to see the wires by the way) and noticed that they were disconnected up near the fuel rail! I think the culprit was an inexperienced mechanice who was spliceing random wires years ago. Anyhow, I checked the injectors before that, they looked clean but didn't see any fuel coming out of the ends. Either way after checking all that I banged on the muffler, did not sound too clogged but it didnt matter because I could not get the pipes disconnected anyway! Either way, with all I checked, I pured a little gas in the TB and she started up. Rough for a few min but I bet the computer was just relearning because it smoothed out eventually. Can't thank you enough for you help and if I have any more issues, and you're around, I would appreciate the help! Thanks again!
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Curly
Dodge Dakota
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8/02/2011
17:41:07
| RE: 3.9L Fuel Problem?
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Message:
Right on DC glad I could help & Happy you got the
ole' girl running ... Take care of it and it will
last these motors were put together well.
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michael Davis
Dodge Dakota
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8/10/2011
16:30:06
| RE: 3.9L Fuel Problem?
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Message:
Hello,I have a 1995 dodge dakota,I had a new exhaust and catylatic converter put on it and then i drove it to the store and shut it off. get back out to it and it cranks and cranks but does not start.I replaced the spark plugs wires,distribitor cap, rotor, coil,give it a shot of gas in the TB and still nothing, could it be the Fuel Pump
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daddio
Dodge Dakota
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8/10/2011
21:25:35
| RE: 3.9L Fuel Problem?
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Message:
Check for codes first. Common problem is a splice leaving the underhood fusebox about 4 to 6 inches below it. Check it, clean it rework it preferably soldering it. Also, crank sensor too. Check for spark and fuel pressure at the fuel rail.
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